[ISSUE #3793]⚡️Remove unused trait-variant workspace dependency from Cargo.toml

[WaterWhisperer]

Which Issue(s) This PR Fixes(Closes)

Fixes #3793

Brief Description

Remove unused trait-variant workspace dependency from Cargo.toml

How Did You Test This Change?

[Copilot]

Pull Request Overview

Removes an unused workspace dependency from the rocketmq crate manifest to simplify Cargo.toml.

• Remove trait-variant dependency entry.
• Keep remaining workspace dependencies unchanged.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[rocketmq-rust-bot]

🔊@WaterWhisperer 🚀Thanks for your contribution🎉！

💡CodeRabbit(AI) will review your code first🔥！

Note

🚨The code review suggestions from CodeRabbit are to be used as a reference only, and the PR submitter can decide whether to make changes based on their own judgment. Ultimately, the project management personnel will conduct the final code review💥.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.48%. Comparing base (000dd49) to head (505959d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4086   +/-   ##
=======================================
  Coverage   26.48%   26.48%           
=======================================
  Files         574      574           
  Lines       81205    81205           
=======================================
  Hits        21507    21507           
  Misses      59698    59698           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[rocketmq-rust-bot]

LGTM